There are a couple of possibilities.
1) You may have a red, white and yellow composite cable plugged into the red, blue and green slots

or:

2)you may have more than one video output going to the TV - to fix this, you will want to remove one of these video outputs; if you have an s-video and a yellow cable in cvbs, unplug the s-video cable; if you have an s-video and a red, blue and green cable plugged in, remove the s-video cable; etc etc.

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Onkyo dvd player plays black white Questions & Answer

I do not have any experience with this system, but the first thing I would try is to use the remote control to manually adjust the screen settings. I would try adjusting the color saturation level (if it is set to zero, the screen will be black and white). If it is set to midrange, then try looking at the display mode, in case there is a "black & white" screen mode. Also, look in the back of the owner's manual for a troubleshooting chart, which might have this problem listed. Try calling the store where you bought it and ask the salesman for help. If it is under warranty, call the company support line (usually a free call). Good luck.

There are a few possibilities.
1)You can connect a red and white AV cable (or the red and white portion of a red, white and yellow cable) from the TV Audio OUTPUT to the "Audio In/TV" portion of the HTS (NOTE: Many TV's do not have an Audio OUTPUT).

2)You can connect a red and white AV cable (or the red and white portion of a red, white and yellow cable) from the Audio OUTPUT of your cable or satellite box to the "Audio In/TV" portion of the HTS.

Note: Using a red and white cable may not give you sound on all 5 speakers.

3)Get a digital audio or SPDIF cable and run it from the TV, Cable or Satellite Box's Digital Audio OUT to the "DIGITAL IN" of the HTS. This will give you the best sound quality. When using this (or any of the other) type of connection, press SURR until you get sound from all 5 speakers.

The Concept of S-video is Splited Video Signal (Luminance for black and white, Chrominance for colors), in your case the luminance is ok but there is no chrominance out.
Expert technician is required:
Check for dry solder at the s-video out outlet.
Good Luck
Toufic Malek

check and see if your dvd player is not on pal if it is then you switch to ntsc.if it is not on pal then check all your connections if every thing is okay its time to call in the tech the dvd is having a problem in the video circuit.good luck.

If you hold the VFP button while a movie is on, you will get a small box on the corner that shows your color. My default color also turned black and white. I just moved over to a user1 color setting (push the right arrow on your remote), and it allows to the change the colors. You might be able to put the colors to come out through here. Hope this helps.